Remove the objectify decorator

The objectify decorator was used to convert DB objects into RPC objects,
but it's not being used anymore since out objects API already has
correspondent methods to match the dbapi ones.

Also, since dbapi methods didn't get a context the decorator was forming
bad RPC objects without a context stored within it.

Change-Id: I892ab6ee2236af040c7f8effcfdfecb293e13ab6
Partial-Bug: #1314732
Merge "Remove the objectify decorator"